基于同位镀铋技术的茶叶及其浸出物中铅含量的测定
Journal of Anhui University of Technology(Natural Science)(2017)
Abstract
以铋膜修饰玻碳电极为工作电极,采用差分脉冲溶出伏安法对茶叶及茶叶浸出物中微量Pb2+进行分析.结果表明,Pb2+在5~300μg·L-1范围内与峰电流呈良好的线性关系,检出限为0.39μg·L-1,相对标准偏差为1.98%(n=11),线性方程为Ip=0.0236ρ(Pb2+)-0.0984,相关系数r=0.9992,茶叶样品中铅含量为0.53~2.98 mg·kg-1,加标回收率为91.5%~113.5%;茶叶浸出物中未检出铅,加标回收率在93.6%~99.5%.
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